Finding the Third Proportional to 31,386 and 67,090

Step by Step Solution

1. Step 1: Write the proportion equation
   31,386 : 67,090 = 67,090 : x
2. Step 2: Convert to fraction form
   31,386/67,090 = 67,090/x
3. Step 3: Cross multiply
   31,386x = 67,090 × 67,090
4. Step 4: Simplify right side
   31,386x = 4,501,068,100
5. Step 5: Solve for x
   x = 4,501,068,100/31,386
6. Step 6: Final answer
   x = 143,410.06